Description

The product photos shown are not of the actual items. Please contact sales@fyplc.cn for details.1. Product Overview

The KONGSBERG MRU‑5‑1 is a high-precision Motion Reference Unit (MRU) developed by Kongsberg Maritime for demanding marine and offshore applications. It is designed to measure vessel motion and attitude in real time, providing highly accurate roll, pitch, heave, acceleration, and angular rate data to onboard control and navigation systems.

As part of the fifth-generation MRU family, the MRU-5-1 integrates advanced MEMS gyros and precision accelerometers to deliver stable motion measurements even in harsh sea conditions. The device is widely used for motion compensation, hydrographic surveying, offshore crane operations, dynamic positioning systems, and subsea equipment control.

With its solid-state sensor design and absence of moving mechanical parts, the unit offers high reliability, long service life, and low maintenance, making it a trusted solution for mission-critical marine systems.

2. Technical Specifications

Product Model: MRU-5-1

Product Type: Motion Reference Unit (MRU)

Manufacturer: Kongsberg Maritime

Power Supply: 12–24 VDC (±15%)

Power Consumption: Approx. 5 W max

Sensors: 3 high-precision accelerometers + 3 MEMS rate gyros

Roll/Pitch Accuracy:

Static: 0.02° RMS

Dynamic: 0.005° (1-sigma at ±5° amplitude)

Angular Orientation Range: ±45°

Heave Measurement Range: Up to ±50 m (adjustable)

Data Output Rate: Up to 200 Hz

Communication Interfaces:

Ethernet

RS-232 / RS-422

CANbus (NMEA 2000)

Protocols Supported: TCP/IP, NMEA 0183, NMEA 2000

Operating Temperature: −20°C to +55°C

Environmental Rating: Marine-grade, IP67 protection

Dimensions: Approx. 82 × 125 × 55 mm

Weight: Approx. 0.58 kg – 2.2 kg (depending on configuration)

3. Key Features and Advantages

High-Precision Motion Measurement
The MRU-5-1 delivers extremely accurate roll and pitch measurements (down to 0.02° RMS), ensuring reliable motion data for high-precision marine operations.

Six-Degree-of-Freedom Motion Data
The unit can output real-time motion parameters including roll, pitch, yaw, heave, surge, and sway, enabling advanced motion compensation for onboard systems.

Advanced Heave Algorithms
The built-in PFreeHeave® algorithm provides accurate heave estimation even in long-period wave conditions, improving performance in hydrographic and offshore measurement tasks.

Multi-Protocol Connectivity
Supports Ethernet, serial, and CAN interfaces, making integration straightforward with marine navigation, sonar, dynamic positioning, and crane control systems.

Marine-Grade Reliability
Designed for harsh maritime environments, the MRU-5-1 uses sealed electronics and solid-state sensors to deliver long service life and stable performance without mechanical wear.

4. Typical Applications

Hydrographic Survey Systems
Used with multibeam echo sounders and sonar equipment to compensate vessel motion and improve seabed mapping accuracy.

Offshore Crane and Lifting Operations
Provides motion data to enable heave compensation for offshore cranes, ensuring safe lifting operations on moving vessels.

Dynamic Positioning (DP) Systems
Supplies real-time motion information for DP systems to maintain vessel position and heading under challenging sea conditions.

ROV and Subsea Operations
Supports underwater robots, subsea positioning systems, and offshore construction equipment by delivering precise motion and orientation data.

5. Frequently Asked Questions (FAQ)

Q1: What is the main function of the KONGSBERG MRU-5-1?
A: It measures vessel motion parameters such as roll, pitch, heave, and angular rates and transmits this data to marine systems for motion compensation and navigation accuracy.

Q2: What systems typically use the MRU-5-1?
A: It is commonly integrated with hydrographic survey equipment, dynamic positioning systems, offshore cranes, and subsea navigation systems.

Q3: Can the MRU-5-1 operate in harsh marine environments?
A: Yes. The unit is designed with marine-grade protection and solid-state sensors, allowing reliable operation under vibration, shock, and harsh sea conditions.